In order to reduce the phenomena of long time queuing and congestion in large-scale crowds’ activities, improve the visitors’ satisfaction and increase social welfare, a multi-stage dynamic coordination model for large scale crowds’ activities based on multi-agent is proposed and a coordination algorithm PCI is designed. Three types of basic coordination algorithms are tested by computer simulation, and the simulation results are used to discuss the basic characteristics of the problem. The results indicate that coordination algorithm PCI can reduce the congestion significantly and ensure better social welfare while meeting the real-time requirement.